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Third-order optical nonlinearity of gold nanoparticle arrays embedded in a BaTiO 3 matrix

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Abstract

Au:BaTiO3 composite films comprising hexagon-shaped Au nanoparticle arrays covered with BaTiO3 matrix were fabricated by double-layer nanosphere lithography and pulsed laser deposition technique. The optical nonlinearity of the composite film was determined using the Z-scan technique at a wavelength of 532nm and a pulse duration of 25ps. The third-order nonlinear optical susceptibility, χ(3), was found to be 2.9×108esu, which is comparable with the best values in metal–dielectric films comprising randomly distributed spherical particles but with much higher metal concentrations. The local electric field enhancement in and near the particles was investigated using the dipole discrete approximation method.

© 2009 Optical Society of America

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